I was diagnosed with ADHD and started on medication at 12, but not really told anything about what it meant for me or how to deal with it, and when I was 18 -literally when my parents dropped me off at college- was told I was autistic
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What the other comrade said is good advice and bupropion in particular I can vouch for (further up in this thread). There are also alternative things that can be supplemented to possibly help with aspects: caffeine+l-theanine which is definitely better than caffeine alone, the taurine found in energy drinks is possibly effective in ADHD (but avoid the sugary ones), modafinil (under prescription from a doctor) which has some alternative benefits if amphetamines aren't well tolerated.
Also if the ADHD is low (but still causing issues) in low doses meds feel like virtually nothing to me, if I wasn't looking for a difference I wouldn't notice one. The Vyvanse that I'm on starts at 10 MG and goes all the way up to 70, I'm just starting to get some improvements at around 50 mg a day but my ADHD is pretty severe evidently. If it is ADHD (not that there's any reason to discount that but there is always the possibility symptoms are an overlap of other comorbidities), a low dose like 10 mg could provide enough benefit without notable side effects, and is worth exploring under administration with a doctor.